GaN-based vertical-cavity surface emitting lasers with sub-milliamp threshold and small divergence angle

P. S. Yeh, C. C. Chang, Y. T. Chen, D. W. Lin, J. S. Liou, C. C. Wu, J. H. He, Hao-Chung Kuo

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34 Scopus citations

Abstract

A GaN-based vertical-cavity surface emitting laser (VCSEL) structure featuring a silicon-diffusion-defined current blocking layer for lateral confinement is described. Sub-milliamp threshold currents were achieved for both 3- and 5-μm-aperture VCSELs under continuous-wave operation at room temperature. The vertical cavity was defined by a top dielectric distributed Bragg reflector (DBR) and a bottom epitaxial DBR. The emission spectrum exhibited a single peak at 411.2 nm with a linewidth of 0.4 nm and a side mode suppression ratio of more than 10 dB before device packaging. The full-width-at-half-maximum divergence angle of the 3-μm-aperture VCSEL was as small as approximately 5° which is the lowest number reported. These results implied the 3-μm-aperture VCSEL was in near single-mode operation.

Original languageEnglish
Article number241103
JournalApplied Physics Letters
Volume109
Issue number24
DOIs
StatePublished - 12 Dec 2016

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